IMR OpenIR
Oxidation Behavior of GH984G Alloy in Steam at 700 degrees C
Wang Changshuai1; Guo Lili1; Tang Liying2; Zhou Rongcan2; Guo Jianting1; Zhou Lanzhang1
Corresponding AuthorWang Changshuai(cswang@imr.ac.cn)
2019-07-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:7Pages:893-901
AbstractTo produce abundant and cheap electricity in a cleaner way, the next generation of advanced ultra-supercritical (A-USC) coal-fired power plants with higher thermal efficiency will operate at service temperatures at 700 degrees C and steam pressures up to 35 MPa. However, the temperature capacity of the currently used terrific or austenitic steels in USC plants at 600 degrees C cannot meet the requirements. GH984G is a newly developed Ni-Fe-Cr base alloy designed for A-USC, but its oxidation behavior in steam at 700 V is unclear. In this work, the oxidation kinetics of GH984G alloy in steam at 700 degrees C was investigated by weighting specimens at intervals. Morphology, composition and phase constituent of the steam oxide scale were characterized using SEM, EDS and XRD. The results show that the oxidation of GH984G alloy follows a parabolic law with a rate constant of 0.00521 mg/(cm(2).h(1/2)) and steady weight gain rate of 8 x 10(-4) g/(m(2).h). The oxide scale mainly consists of Cr2O3 and Al2O3. Meanwhile, a small amount of TiO2 was observed. The oxide scale of Cr2O3 forms on the alloy surface and then the internal oxidation of Al to be Al2O3 occurs along the grain boundaries of the matrix alloy and TiO2 forms at the surface of the external oxide scale. The morphology of Cr2O3 at the surface of the oxide scale is needle-like at the initial oxidation stage and then the agglomeration of Cr2O3 was observed and the cellular shape forms. Finally, the coalescence of the cellular Cr2O3 appears and the flat surface of the external oxide scale forms. The excellent oxidation resistant of GH984G alloy in steam at 700 degrees C can be attributed to the compact external oxide scale of Cr2O3 and the root-like internal oxide scale of Al2O3.
KeywordGH984G alloy Ni-Fe-Cr base alloy steam oxidation 700 degrees C ultra-supercritical coal-fired power plant
Funding OrganizationNational Key Research and Development Program of China ; National High Technology Research and Development Program of China ; National Natural Science Foundation of China ; National Energy Administration Program of China ; Science and Technology Program of Sichuan Province
DOI10.11900/0412.1961.2018.00440
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFB0305204] ; National High Technology Research and Development Program of China[2012AA03A501] ; National Natural Science Foundation of China[51301171] ; National Energy Administration Program of China[NY20150102] ; Science and Technology Program of Sichuan Province[2016JZ0036]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000471268000009
PublisherSCIENCE PRESS
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/134142
Collection中国科学院金属研究所
Corresponding AuthorWang Changshuai
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Xian Thermal Power Res Inst Co Ltd, Xian 710032, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Wang Changshuai,Guo Lili,Tang Liying,et al. Oxidation Behavior of GH984G Alloy in Steam at 700 degrees C[J]. ACTA METALLURGICA SINICA,2019,55(7):893-901.
APA Wang Changshuai,Guo Lili,Tang Liying,Zhou Rongcan,Guo Jianting,&Zhou Lanzhang.(2019).Oxidation Behavior of GH984G Alloy in Steam at 700 degrees C.ACTA METALLURGICA SINICA,55(7),893-901.
MLA Wang Changshuai,et al."Oxidation Behavior of GH984G Alloy in Steam at 700 degrees C".ACTA METALLURGICA SINICA 55.7(2019):893-901.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wang Changshuai]'s Articles
[Guo Lili]'s Articles
[Tang Liying]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wang Changshuai]'s Articles
[Guo Lili]'s Articles
[Tang Liying]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wang Changshuai]'s Articles
[Guo Lili]'s Articles
[Tang Liying]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.